/* 
 * CVS identifier:
 * 
 * $Id: CompTransfSpec.java,v 1.18 2001/04/10 14:23:26 grosbois Exp $
 * 
 * Class:                   CompTransfSpec
 * 
 * Description:             Component Transformation specification
 * 
 * 
 * 
 * COPYRIGHT:
 * 
 * This software module was originally developed by Raphaël Grosbois and
 * Diego Santa Cruz (Swiss Federal Institute of Technology-EPFL); Joel
 * Askelöf (Ericsson Radio Systems AB); and Bertrand Berthelot, David
 * Bouchard, Félix Henry, Gerard Mozelle and Patrice Onno (Canon Research
 * Centre France S.A) in the course of development of the JPEG2000
 * standard as specified by ISO/IEC 15444 (JPEG 2000 Standard). This
 * software module is an implementation of a part of the JPEG 2000
 * Standard. Swiss Federal Institute of Technology-EPFL, Ericsson Radio
 * Systems AB and Canon Research Centre France S.A (collectively JJ2000
 * Partners) agree not to assert against ISO/IEC and users of the JPEG
 * 2000 Standard (Users) any of their rights under the copyright, not
 * including other intellectual property rights, for this software module
 * with respect to the usage by ISO/IEC and Users of this software module
 * or modifications thereof for use in hardware or software products
 * claiming conformance to the JPEG 2000 Standard. Those intending to use
 * this software module in hardware or software products are advised that
 * their use may infringe existing patents. The original developers of
 * this software module, JJ2000 Partners and ISO/IEC assume no liability
 * for use of this software module or modifications thereof. No license
 * or right to this software module is granted for non JPEG 2000 Standard
 * conforming products. JJ2000 Partners have full right to use this
 * software module for his/her own purpose, assign or donate this
 * software module to any third party and to inhibit third parties from
 * using this software module for non JPEG 2000 Standard conforming
 * products. This copyright notice must be included in all copies or
 * derivative works of this software module.
 * 
 * Copyright (c) 1999/2000 JJ2000 Partners.
 *  */
package jj2000.j2k.image;

import jj2000.j2k.image.invcomptransf.*;
import jj2000.j2k.wavelet.*;
import jj2000.j2k.util.*;
import jj2000.j2k.*;

import java.util.*;

/**
 * This class extends the ModuleSpec class in order to hold tile
 * specifications for multiple component transformation
 *
 * @see ModuleSpec
 * */
public class CompTransfSpec extends ModuleSpec {
    
    /** 
     * Constructs an empty 'CompTransfSpec' with the specified number of tiles
     * and components. This constructor is called by the decoder. Note: The
     * number of component is here for symmetry purpose. It is useless since
     * only tile specifications are meaningful.
     *
     * @param nt Number of tiles
     *
     * @param nc Number of components
     *
     * @param type the type of the specification module i.e. tile specific,
     * component specific or both.
     * */
    public CompTransfSpec(int nt, int nc, byte type){
	super(nt, nc, type);
    }


    /** 
     * Check if component transformation is used in any of the tiles. This
     * method must not be used by the encoder.
     *
     * @return True if a component transformation is used in at least on
     * tile.
     * */
    public boolean isCompTransfUsed(){
        if( ((Integer)def).intValue() != InvCompTransf.NONE ){
            return true;
        }
     
        if(tileDef!=null){
            for(int t=nTiles-1; t>=0; t--){
                if(tileDef[t]!=null && 
                   ( ((Integer)tileDef[t]).intValue() != InvCompTransf.NONE) ){
                    return true;
                }
            }
        }
        return false;
    }
}
